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From: Gregory Maxwell <gmaxwell@gmail.com>
To: Luke Dashjr <luke@dashjr.org>
Cc: Bitcoin Dev <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] [BIP] Normalized transaction IDs
Date: Wed, 21 Oct 2015 08:26:47 +0000	[thread overview]
Message-ID: <CAAS2fgR7X2j9buFQXvgmWZCfoasRa=nLB5efnu-ZnqFZC+SeuQ@mail.gmail.com> (raw)
In-Reply-To: <CAAS2fgT4DU1MuOwo0Qr4yMNRamajD=KrOVP93pzApWMpry-Srg@mail.gmail.com>

On Wed, Oct 21, 2015 at 7:48 AM, Gregory Maxwell <gmaxwell@gmail.com> wrote:
> I'm still sad that uniform segregated witeness is so hard to deploy,
> adding another id to every utxo set won't be a nice cost. :( But I
> have been trying for a long time to come up with anything better and
> not being successful.

Oh good. Luke solved it.

To deploy SW without a disruptive flag day this encoding could be used:

A new P2SH like scriptPubkey type is defined. In the soft-fork, the
scriptsig for this scriptPubkey is required to be empty.

Signatures are not covered under txid, but carried along side. Then
committed to in blocks in a separate hashtree.

The only disadvantage to the approach used in elements alpha that I
can come up with so far (in the few minutes since luke turned my can't
into a can) is that that the approach in EA did not disrupt the normal
relay handling process, and this would, since relay that transports
the extradata either needs to use a different hash that includes the
witness, or have a separate mechanism for witness transport.


  reply	other threads:[~2015-10-21  8:26 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-10-19 14:01 [bitcoin-dev] [BIP] Normalized transaction IDs Christian Decker
2015-10-19 15:23 ` Tier Nolan
2015-10-19 19:28   ` Christian Decker
2015-10-19 22:22   ` s7r
2015-10-20 10:30     ` Christian Decker
2015-10-21  6:18 ` Luke Dashjr
2015-10-21  7:39   ` Christian Decker
2015-10-21  7:52     ` Luke Dashjr
2015-10-21  8:31       ` Christian Decker
2015-10-21  8:39         ` Luke Dashjr
2015-10-21  8:44           ` Christian Decker
2015-10-21  8:46             ` Luke Dashjr
2015-10-21 18:22               ` Danny Thorpe
2015-10-21 19:27                 ` Gregory Maxwell
2015-10-21 23:20                 ` Luke Dashjr
2015-10-22  8:26                   ` Christian Decker
2015-10-22  8:57                     ` Gregory Maxwell
2015-10-22 11:54                       ` Christian Decker
2015-10-22  9:05                     ` Luke Dashjr
2015-11-03 20:37                       ` Christian Decker
2015-11-03 20:48                         ` Luke Dashjr
2015-11-03 21:44                           ` Christian Decker
2015-11-03 22:01                             ` Luke Dashjr
2015-11-05 15:27                               ` Jorge Timón
2015-11-05 19:36                                 ` Luke Dashjr
2015-11-05 20:25                                   ` Jorge Timón
2015-11-05 22:46                                     ` s7r
2015-11-05 22:29                                   ` Adam Back
2015-11-06 14:52                                 ` Christian Decker
2015-11-04  4:00                             ` Peter Todd
2015-11-05  9:38                               ` Christian Decker
2015-10-21  7:48   ` Gregory Maxwell
2015-10-21  8:26     ` Gregory Maxwell [this message]
2015-10-21  8:49       ` Christian Decker
2015-10-21  8:50         ` Christian Decker
2015-10-21 10:14         ` Gregory Maxwell

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